Panel Fastener: Completely pre-assembled spring-loaded panel fasteners. Thread sizes #4 to ... 4" and M3 to M6 Panel Fastener assembly: Spring loaded panel fastener, Low-profile panel fastener,Panel ... fastenerJPF30,JPF31,JPF32 products are Completely pre-assembled spring-loaded panel fasteners.Thread sizes #4 to 1/ ... six-lobe, slooted ,philips,slot/philips,hexagon. Spring loaded Panel fastener